style tests

attached are the style tests i've written to this point:

-- backgroundColor
-- style
-- styling
-- textAlign
-- textDecoration

i used philippe's tts:color tests as a template.

these tests are compatible with NCAM and Adobe players, meaning not  
all values will be exercised (our textDecoration implementation  
supports only "underline" and "none", for example).

one question:  how do i know when i've written sufficient tests for  
each attribute?

any and all comments welcome.

thanks.
g.